nixos-config/flake-mods/allowUnfree.nix

{inputs, ...}: {
  perSystem = {system, ...}: {
    _module.args.pkgs = import inputs.nixpkgs {
      inherit system;
      config.allowUnfree = true;
      # The allowUnfreePredicate is due to home-manager#2942 (I haven't actually checked that it is necessary)
      # https://github.com/nix-community/home-manager/issues/2942
      config.allowUnfreePredicate = _: true;
    };
  };
}